add more exported routines and allow select area to be deleted

Author: robyww

src/firefly/js/api/ApiUtilImage.jsx

@@ -33,6 +33,8 @@ export {RequestType} from '../visualize/RequestType';
 export {ExpandType, dispatchApiToolsView} from '../visualize/ImagePlotCntlr.js';
 export {CsysConverter} from '../visualize/CsysConverter.js';
 export {CCUtil} from '../visualize/CsysConverter.js';
+export {primePlot} from '../visualize/PlotViewUtil.js';
+export {visRoot} from '../visualize/ImagePlotCntlr.js';
 export {watchCoverage} from '../visualize/saga/CoverageWatcher.js';
 import {watchImageMetaData} from '../visualize/saga/ImageMetaDataWatcher.js';
 

src/firefly/js/drawingLayers/SelectArea.js

@@ -93,7 +93,7 @@ function creator() {
     var options= {
         canUseMouse:true,
         canUserChangeColor: ColorChangeType.DISABLE,
-        canUserDelete: false,
+        canUserDelete: true,
         destroyWhenAllDetached: true
     };
     return DrawLayer.makeDrawLayer( `${ID}-${idCnt}`, TYPE_ID, 'Selection Tool',